Filtering and inerting of combustible dusts in the process off-gas
AssigneeWacker Siltronic AG
InventorsFranz Becker, Lothar Lehmann, Horst Wachtler
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Abstract
A method for avoiding the spontaneous ignition of combustible dusts in process off-gases, wherein during the process the dusts are retained, without adversely affecting the process parameters, at least one sintered filter element which is arranged in a pressure vessel and is able to withstand temperatures of up to at least 250° C. and after the process has ended the dusts are inerted by blasting oxygen-containing gas back into the pressure vessel, and to a device for carrying out the method.
Claims14
A method for avoiding the spontaneous ignition of combustible dusts in process off-gases;
- comprising
- during a process retaining the dusts, without adversely affecting process parameters;
- arranging at least one sintered filter element in a pressure vessel, and said filter element is able to withstand temperatures of up to at least 250° C.;
- and after the process has ended the dusts are inerted by blasting oxygen-containing gas back into the pressure vessel.
A device for carrying out a method for avoiding the spontaneous ignition of combustible dusts in process off-gases, which device comprises
- (a) a process installation, in which off-gases containing highly reactive, spontaneously igniting and toxic dusts are formed;
- (b) an off-gas discharge, which can be closed off with respect to the process installation, including at least one valve for supplying fresh air;
- (c) a pressure vessel with discharge flange, in which at least one sintered filter element, which is able to withstand temperatures of up to at least 250° C., is arranged,
- (d) a vacuum system;
- (e) a ventilation line;
- and
- (f) a nonreturn valve, which is connected to the pressure vessel, the vacuum system and the ventilation line.
Dependencies are inferred from the claim text.